Demonstrate Understanding of Scientific Concepts and Principles Practice Test

A researcher analyzes a first-order drug elimination process where concentration decays as $C(t)=C_0 e^{-kt}$. Two patients have the same initial concentration $C_0$, but Patient 2 has a larger elimination rate constant $k$. Which observation is most consistent with the exponential decay model?

A radiology phantom is used to compare attenuation of X-rays through two tissues. The intensity follows $I = I_0 e^{-\mu x}$, where $\mu$ is the attenuation coefficient and $x$ is thickness. Tissue 1 has a larger $\mu$ than Tissue 2 at the same photon energy. For equal thicknesses, which observation is most consistent with the attenuation model?